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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Options Activity

Stock options A summary of the Company’s stock option activity for the three months ended March 31, 2013 is as follows:

 
Shares under option
(thousands)
 
Weighted average exercise price
 
Weighted average remaining contractual life
(in years)
 
Aggregate intrinsic value
(in millions)
Outstanding and exercisable at December 31, 2012
1,436

 
$
30.65

 
3.4
 
$
58.8

Exercised
(81
)
 
$
28.43

 
 
 

Outstanding and exercisable at March 31, 2013
1,355

 
$
30.78

 
3.2
 
$
63.1
Nonvested Restricted Stock Activity
A summary of the Company’s nonvested restricted stock for the three months ended March 31, 2013 is as follows:
 
Shares subject to restriction
(thousands)
 
Weighted average price
Nonvested at December 31, 2012
1,032

 
$
58.77

Granted
372

 
$
75.41

Vested
(331
)
 
$
47.69

Forfeited
(19
)
 
$
68.14

Nonvested at March 31, 2013
1,054

 
$
67.71